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Solve x^2 + 15x = - 50

  1. x2 + 15 x + 50 = 0 (rearrange by adding 50 to both sides)

  2. (x + 10)(x + 5) = 0 (factorise the quadratic equation)

  3. x + 10 = 0 or x + 5 = 0 (for the above to equal zero, at least one of the bracketed terms must equal zero)

  4. x = -10 or x = -5 (solving the two equations that result from step 3)

  5. The solution is x = -10, x = -5

Answered by Julia S. Maths tutor

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Answered by Julia S.
Maths tutor

753 Views

See similar Maths GCSE tutors
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